diff --git a/src/plugins/sib-history-improved.js b/src/plugins/sib-history-improved.js
index 80a5c667836aaef681452ff804a16a1458264b76..54ab5aa58ab1fc793e01dd3d4990d95823a3e23c 100644
--- a/src/plugins/sib-history-improved.js
+++ b/src/plugins/sib-history-improved.js
@@ -70,7 +70,7 @@ converse.plugins.add('sib-history-improved', {
 
       log.debug(`Chatbox needs more messages, count: ${counter}`);
 
-      const is_groupchat = data.chatbox.get('type') === converse.CHATROOMS_TYPE;
+      const is_groupchat = data.chatbox.get('type') === _converse.CHATROOMS_TYPE;
       const oldest_message = messages[0] || null;
 
       if (oldest_message) {